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Fair Value Measurements (Details) - USD ($) $ in Millions | May. 31, 2015 | May. 31, 2014
--- | --- | ---
Available-for-sale securities: |  |  |
Available-for-sale securities |  | $ 3,595.6 | $ 3,391.4
Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 103.1 | 65.8
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 3,595.6 | 3,391.4
Other |  | 14.2 | 12.3
Liabilities: |  |  |
Other long-term liabilities |  | 14.2 | 12.3
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 15.0 | 6.0
General obligation municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 1,703.7 | 1,628.5
General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 55.1 | 10.9
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 1,703.7 | 1,628.5
Pre-refunded municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities | [1] | 102.7 | 142.8
Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 20.5 | 31.2
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 102.7 | 142.8
Revenue municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 963.6 | 867.8
Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 12.3 | 17.7
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 963.6 | 867.8
Money market securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.2 |
Variable Rate Demand Obligation [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 825.6 | 752.3
Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 825.6 | 752.3
Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.2 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Other |  | 14.2 | 12.3
Liabilities: |  |  |
Other long-term liabilities |  | 14.2 | 12.3
Quoted prices in active markets (Level 1) [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Quoted prices in active markets (Level 1) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Quoted prices in active markets (Level 1) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Quoted prices in active markets (Level 1) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Quoted prices in active markets (Level 1) [Member] | Money market securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.2 |
Quoted prices in active markets (Level 1) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 102.9 | 65.8
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 3,595.6 | 3,391.4
Other |  | 0.0 | 0.0
Liabilities: |  |  |
Other long-term liabilities |  | 0.0 | 0.0
Significant other observable Inputs (Level 2) [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 15.0 | 6.0
Significant other observable Inputs (Level 2) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 55.1 | 10.9
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 1,703.7 | 1,628.5
Significant other observable Inputs (Level 2) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 20.5 | 31.2
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 102.7 | 142.8
Significant other observable Inputs (Level 2) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 12.3 | 17.7
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 963.6 | 867.8
Significant other observable Inputs (Level 2) [Member] | Money market securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 |
Significant other observable Inputs (Level 2) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 825.6 | 752.3
Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Other |  | 0.0 | 0.0
Liabilities: |  |  |
Other long-term liabilities |  | 0.0 | 0.0
Significant unobservable Inputs (Level 3) [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Significant unobservable Inputs (Level 3) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Significant unobservable Inputs (Level 3) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Significant unobservable Inputs (Level 3) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 | 0.0
Available-for-sale securities: |  |  |
Available-for-sale securities |  | 0.0 | 0.0
Significant unobservable Inputs (Level 3) [Member] | Money market securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash Equivalents |  | 0.0 |
Significant unobservable Inputs (Level 3) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities |  | $ 0.0 | $ 0.0
[1] | (1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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